3501057
귀찮을 땐 reflection이 제 맛
1788602
2009-05-28T19:36:33Z
http://rath.springnote.com/pages/3501057
2009-05-28T19:15:53Z
<p>아무리 IDE가 좋아졌다할지라도 라디오 버튼, 체크 박스, 콤보 박스, 텍스트 필드가 적절히 섞여 30여개의 입력 필드가 한 화면에펼쳐져 있다면 유쾌히 코딩하기 쉽지 않다. </p>
<p> </p>
<p>여기에 한 필드라도 고쳐지면 'Save' 버튼이 활성화되어야 하고 그렇지 않다면 비활성화 되어야 한다는 요구가 들어온다면?</p>
<p> </p>
<p><img class="attachment" title="htm_20040809011613070000070100-001.jpg" src="/pages/3501057/attachments/1644023" alt="htm_20040809011613070000070100-001.jpg" /></p>
<p> </p>
<p>부들부들.</p>
<p> </p>
<p>리플렉션의 이름으로 그대를 처단하겠다.</p>
<p> </p>
<p> </p>
<ol class="code">
<li> private void installModifyListeners() {</li>
<li> ActionListener al = new ActionListener() {</li>
<li> @Override</li>
<li> public void actionPerformed(ActionEvent e) {</li>
<li> fireModified("various buttons");</li>
<li> } </li>
<li> };</li>
<li> KeyListener kl = new KeyAdapter() {</li>
<li> @Override</li>
<li> public void keyReleased(KeyEvent e) { </li>
<li> fireModified("various fields");</li>
<li> }</li>
<li> };</li>
<li> </li>
<li> Field[] fields = this.getClass().getDeclaredFields();</li>
<li> for(Field f : fields) { </li>
<li> try {</li>
<li> Object o = f.get(this);</li>
<li> if( o instanceof JComponent ) { </li>
<li> try {</li>
<li> Method m = o.getClass().getMethod("addActionListener", ActionListener.class);</li>
<li> if( m!=null ) { </li>
<li> m.invoke(o, al);</li>
<li> continue;</li>
<li> }</li>
<li> </li>
<li> } catch( NoSuchMethodException e ) {}</li>
<li> }</li>
<li> </li>
<li> if( o instanceof JTextComponent ) { </li>
<li> try {</li>
<li> Method m = o.getClass().getMethod("addKeyListener", KeyListener.class);</li>
<li> if( m!=null ) </li>
<li> m.invoke(o, kl);</li>
<li> } catch( NoSuchMethodException e ) {}</li>
<li> }</li>
<li> } catch (Exception e) {</li>
<li> System.err.println(e);</li>
<li> }</li>
<li> }</li>
<li> }</li>
</ol>
<p> </p>
<p> </p>
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